thank You very much. Nope no grooves. I just took some serious measuring and then measuring again every few slats to make sure they fit as perfectly as i could get them. Then i used a toothpick to place the glue so it would not be seen. Thats why it took a bit to get this canopy done. But i guess I'm a little like you. Always trying to push myself to do better and loving a bit of a challenge...